Add ios_lldp module (#34308)

* Add ios_lldp module

*  Implementation of ios_lldp module
*  Integration test for ios_lldp module

* Minor change

test/integration/targets/ios_lldp/defaults/main.yaml

@@ -0,0 +1,2 @@
+---
+testcase: "*"

test/integration/targets/ios_lldp/meta/main.yaml

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+dependencies:
+  - prepare_ios_tests

test/integration/targets/ios_lldp/tasks/cli.yaml

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+---
+- name: collect all cli test cases
+  find:
+    paths: "{{ role_path }}/tests/cli"
+    patterns: "{{ testcase }}.yaml"
+  register: test_cases
+  delegate_to: localhost
+
+- name: set test_items
+  set_fact: test_items="{{ test_cases.files | map(attribute='path') | list }}"
+
+- name: run test cases (connection=network_cli)
+  include: "{{ test_case_to_run }} ansible_connection=network_cli ansible_become=yes"
+  with_items: "{{ test_items }}"
+  loop_control:
+    loop_var: test_case_to_run
+
+- name: run test case (connection=local)
+  include: "{{ test_case_to_run }} ansible_connection=local"
+  with_first_found: "{{ test_items }}"
+  loop_control:
+    loop_var: test_case_to_run

test/integration/targets/ios_lldp/tasks/main.yaml

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+---
+- { include: cli.yaml, tags: ['cli'] }

test/integration/targets/ios_lldp/tests/cli/basic.yaml

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+---
+- debug: msg="START ios_lldp cli/basic.yaml on connection={{ ansible_connection }}"
+
+- name: Make sure LLDP is not running before tests
+  ios_config:
+    lines: no lldp run
+    authorize: yes
+
+- name: Enable LLDP service
+  ios_lldp:
+    state: present
+    authorize: yes
+  register: result
+
+- assert:
+    that:
+      - 'result.changed == true'
+      - '"lldp run" in result.commands'
+
+- name: Enable LLDP service again (idempotent)
+  ios_lldp:
+    state: present
+    authorize: yes
+  register: result
+
+- assert:
+    that:
+      - 'result.changed == false'
+
+- name: Disable LLDP service
+  ios_lldp:
+    state: absent
+    authorize: yes
+  register: result
+
+- assert:
+    that:
+      - 'result.changed == true'
+      - '"no lldp run" in result.commands'
+
+- name: Disable LLDP service (idempotent)
+  ios_lldp:
+    state: absent
+    authorize: yes
+  register: result
+
+- assert:
+    that:
+      - 'result.changed == false'
+
+- debug: msg="END ios_lldp cli/basic.yaml on connection={{ ansible_connection }}"